Cold showers can boost your focus and energy quickly. It works by training your nervous system to handle stress better.

Start with water around 55 to 60 degrees. Step in and take slow, deep breaths for about 30 seconds. Then make it colder and stay under for two minutes. After, just let your body warm up on its own.

The key is to keep your breathing steady. Don’t gasp. The mental boost comes from staying calm even when it’s uncomfortable. (1/2)